Methods

We have obtained 3D models of dogs’ limbs by employing our in-house software – WimbaSCAN, which utilizes photogrammetry for 3D acquisition. To overcome the challenge of hair disrupting the Iimb’s dimensions, we developed a special pattern applied to a material that adheres to the limb. Using this method, a short video of the limb is recorded with a regular smartphone and then sent to our server for further analysis. The video data is then utilized to generate a precise 3D model.

Comparison of Measurement Collection Methods

The traditional method of creating a plaster cast typically takes around an hour, depending on factors such as the dog’s behavior, the size of the limb, and the skill of the person taking the measurements. It consists of 9 main steps (see graph below):

WimbaSCAN Method

The method of scanning the limb on the special WimbaSCAN callibration mat involves only six fairly simple steps (see graph below):

WimbaSCAN is a scanning method that takes 4-5 minutes to capture a very accurate 3D model of the scanned limb. Scanning time depends mainly on the behavior of the dog and the skill of the measure taker.

Challenges and How We Overcame Them

The study involved 69 dogs, of which 66 had accurate measurements on the first attempt. For the remaining three, two measurement failures were due to abnormalities in the scans caused by poor lighting conditions. In one case, both the video and measurements were of insufficient quality.

To address these issues, measurements for all three dogs were re-collected, this time ensuring proper lighting and greater attention to detail during the scanning process.

Once accurate measurements were secured, the orthoses were designed to precisely match each dog’s anatomy, ensuring a comfortable fit and effective support. The final designs were then 3D printed, resulting in custom-made orthoses tailored to each dog’s specific needs.

“As for the measurements, they are definitely easier than traditional casting. The whole process probably takes 30 minutes, whereas I’d block out at least an hour for traditional casting.”
Cara McNamee, DVM, cVMA, CCRT